Measured-service telephone system



Oct. 13, 1925 F. T. MADSEN lEAsuRBD SERVICE TELEPHONE sYs'ru 16 The principal object 'of the invention is Patented Oct. 13, 1925.

l UNITED STATES FRED T.

`neiifsoiterissttmrree Application area hay 5,

To aZZ whom it may oom'em:

Be it known that I, FRED T. Mensen, 'a `citizen o'f tire United Sta-tes of America, "and a resident ott Maywood, Cook County,

s `end Steteo Illinois, have invented certain new and useful Improvements in Mea'stred- Service' Telephone Systems, of wlu'i'ch the following is a specification.

' `The present invention relates in general to measured service telephone systems, ont

ls concerned `more particularly with improved circuits for controlling, measured 'service 'apparatus for use in automatic telephone systems.

tov4 provide novelY and `eeif'ent iorewlt errangements for `use in controlling` ptysta.- tion eqgpment of the type in which the cell- 'i'ng 4'sn 'scriber is not required to deposit the coin or token until the called sbsorlloel" responds. Y Another object is `to arrange the above oireute so that no additions or "changes need l be mede in the switehllook springoombihe- `tion of the standard substation apptrzt'tus.

A still further object le to provide en rangement of oirouits Wfllieh will censo-the operation of the pay :station rn'avnet when@ reellel subscriber enswers, but willich cannot -be restored Joy `the called subscriber again operating his receiver hook.

' In the accompanying drawing are 'shown diagramm'aticelly only `suoli circuits of an automatic telephone system as ere consid- 'ered necessery to y,clearly illustra-te the invention. Tlie` substation A is 'provided With the usual receiver "20, transmitter 9, switchlio'ok 2l, induction coil 22, and "signalling device 23; Being an -autonltttic substation, 0 there is ralso `protfi'ded the 'usual eellngdevice C. D.

The peystetlon epperetus PS associated with tle substation A is of 'simile-r constrnotion to that sliow'n and described in Patent 451,225,608 'issued' to `John Erickson Mey '18, 1917. 'Tlle only difference being that 'an additional pair 'of springs have been ^welded, l'which sp1-ings are closed when the Icelled subscriber responds lont gire not arranged 5 tobe opened when n coin is deposited.

` The two line ,Conductors 1 and 2 extend to the exchange/where they terminate 'preferably in en individilal. lin'e' switch o11 4trunk PATENT' 1 omet.

1792.3. SeralNo.` 596,836.

seleetot o, of whiell only the two :line wipers Tere 'shown herein. The leeewitell G may loe of any approved type elli-d is operable oF MMIV/'0015, immers, AssIeNot. `io Aofronlino, ErJoTnrc COMPANY, or CHICAGO, rumors, A consommant on ILLINOIS. l

1pon the' -elosiire of the linefe'iiettlt `et the substation A 'to extend the line eondnotors 1 and Q ieto connection 4with e tmetk liefe terminating 111 A4et nniner'ioal seleotor or neotor switch, afs the 'oase lite, depending on the sizeof the exchange For the" f sake of simploty, no selector switohes' lieve indicated in the drawing, being itssunxod 'that 'the line switollffllafs direct acoess to a conneotor switch whiolr in turn has `access to 'a g'r'uptof subscribers? lines,

'one of which ils ,the line of lfslibst'ition'A'.

The e'cfnlsweotor` H, like the line ewlteh C, may te of any approved two wire type, its only essentiel elleeaete'rlstle beleg the 'provision of moans whereby, upon the leeponee of the tailed stbeeslleel, theinoomleg line oonduetor's are ieversed' te regel-eds their oonneetlon to windings of the line or `eeel-.rollin"g relay the eoameetor shown the line "eoneloetorsi and e betete tennineting the windings of the line retevereing f jsprinfgs on l the beek lotldge teley 4l 'Lineseleotoe ooene'ct'ofr switches fof sitatlle construction are ysliolfn in U. S. patentto New-forth, Reissue No. 13,901, loten Apen is, loro.

To `'ptooeecl with the eleeerlptioe of operation, it vlfillk loe assu-'med `that the "silbscriber et substation A desires to ,obtain leolmoetiojn with the euoeerlter et substation A. the teteovel er the reeeiver et substation A, ztoironlit isclosed over which curlentfromtlre eziollang btttely (Wlllicll is normally bridged t'cosstlie line conductors l and ,-2` in'slari'e-es'with the line relay oi `the lin'eswitch- C) `flows as follows;V Line oon- :dnotor l on tli'e right olf `tlie condenser 6, ti'fil'flding"24ev of tlle polri'zed' {nwgnetl 5, barok to line ,eondeoto'r i on the left heeel el/deof the condenser o, impulse Springs 7 of tte calling I(llevis C. D., switohhook springs g8, transmitter 9i, pj'rimafrywinding of this 'iliduotion 'eoil22 to line conduit-tor BV the eloeere of this elfe-ult the line Switch 'o 'le operatedto fextend the line oondnctors l and 2 to `tlre line rolty of an idle onootor The remove-l of'tlie receiver also closes the ,receiver oiroit, `which a Lloool oirol-iit i-neloeingf the switolilroek, the 'reeerlver so,

4nector H is operated in the usual and well known manner to complete the desired connection, it being` assumed that the line of substation A is not busy at the time. During the operation of the calling device the `shunt springsy 10 are closed to short circuit the receiver and the transmitter.` This is the usual provision made to reduce the resistance and impedance of the line circuit during the transmission of impulses, and lto prevent noises in the receiver. c

Assuming that the-,called subscriber re- -sponds to the call, when the receiver is removed the substation ,A is sup-plied with talking battery through tlhe windings of the back bridge relay 4. This relay is there-A fore energized to reverse the line conductors 1 and 2 as regards their connection to the windings of the line relay 3. Current now `flows over the linecircuitand through the winding 24 of the polarized magnet 5 in the reverse direction. This reversal of the current causesthe polarized relay of the coin collecting' devicel atsubstation A to attract Y. its armature in the opposite direction, that is,

toward the coil 24.l 'When the armature is attracted in this direction it carries the arm 13 to the right, forcing the springs 14, 15 and 16 'into engagement. The armature itself also closes springs 19. The `engagement of springs 14, 15, and 16 short circuits the transmitter, and connects the resistance 17 in shunt with the primary winding ofL the inductioncoil 22. The short circuiting of the transmitter 9 makes it impossible for tlhe calling subscriber to talk to the called` subscriber through the medium thereof. The shunting of the primary winding of the induction coil 22 does not prevent the calling subscriber from hearing the called subscriber answer, but does not allow him to converse through his receiver. When the calling subscriber hears the called subscriber answer he deposits a coin in thecoin chute. This coin, in passing down the chute, releases the arm 13 from the arm l2, thereby allowing 3 lenergize winding 25 of tlhe magnet 5`torethe springs 14, 15 and 16 to separate. The

separation of these springs leaves the talk- I converse over the circuits represented by the heavily drawn lines. It will be noted that since springs 19 are controlled directly by the armature 11, that they will not be affected by the deposit of the coin. The purpose of tlhese springs will be brought out subsequently.

Should`Y the called subscriber for any reason operate his switchhook after he has answered, resulting in the original current liow being again established as regards lines 1 and 2, the polarized magnet 5 will .not be aected, as the tension of the spring 18, and t-he sharp angle of the catclh, or incline on the arm 13 act to prevent the armature from being restored by the energization of windin 24 of the magnet. It will be seen that 'this arrangement is very essential, as some,-A

subscribers inay attempt to signalan operator by jiggling the switchhook were the above means iiotpi'ovided, the-springs 14, 15 and 16 would be again closed and the calling subscriber wouldlhave to deposit a seccould be oonitiated in well known manner, by the hang-r ing up of the receiver at the calling substation..

It will be recalled that when the called subscriber responded that the operation of the magnet 5 resulted in the `closure of springs 19. The closure of tlhese springs completed a circuit extending from lineconductor 1 at the right of condenser 6, springs 19, winding 25 of the polarized-magnet 5, transmitter 9, and the primaryvwinding Vof the induction coil 22 to line conductor 2.

This circuit is for restoring the paystation apparatus to normal, and is not effective while the receiver is oft' the hook at the station A, as winding 25 is partiall short circuited by a circuit extending t rouglh the relatively low resistance of Winding 24 of the magnet 5. This shunt circuit may be traced from line 1 at the right of condenser 6,

(low) winding 24 of magnet 5, yline 1 at,

left of condenser 6, calling device springs 7,

i switchhook springs 8, (high) winding 25 Vof magnet, and contacts 19 back to line 1.

Now when the calling subscriber replaces his receiver the shunt circuit around winding 25 is removed. Since the winding 25 is very high the line relay 3 of the connector cannot remain energized, and this .relay in restoring causes the usual circuit for releasing the connector H to be completed, and also causes i Vthe line switch C to restore the normal exchange battery to line lconductors 1 and 2.

This normal exchange rbattery will now store the arm 12 into its normal position at the left of the catch on arm 13, and also to vbreak its own circuit at contacts 19.

tected by Letters lPatent will be pointed out in the appended claims.

What is claimed is:

l. In a telephone system, calling and called lines, means including automatic switches for interconnecting said lines, paystation mechanism associated with the calling line, said paystation mechanism being provided with a polarized relay, said polarized relay having a high impedance winding and a low impedance winding, contacts in the calling telephone operated by the removal of the receiver for completing a circuit for one winding of said polarized relay, means effective when the called subscriber removes his receiver to cause current to flow through said relay in the proper direction to operate it, contacts on said relay closed when the same is operated to complete an operating circuit through the other winding of said relay, and means for making said last circuit ineective while the calling subscriber has his receiver olii.l the hook.

2. In a telephone system, calling and called lilies, means including automatic switches for interconnecting said lines, paystation mechanism associated with the calling line, sa-idpaystation mechanism bein 'g provided 4with a polarized relay, said polarized relay having two windings, contacts in the calling telephone operated by the removal of the receiver for completing a circuit Yfor one winding of said polarized relay, means efectivewhen the called subscriber removes his receiver to cause current to flow thro-ugh said relay in the proper direction to operate it, contacts on said relay closed when the same is operated to complete an operating circuit through thc other winding of said relay, and switchhook springs for maintaining the operating circuit of said other winding shunted by the said first Winding to prevent the resto-ring operation of said magnet while the receiver is oli' the hook.

3. In a telephone system, calling and called lines, means including automatic switches for interconnecting said lines, paystation mechanism associated with certain of said lines, said payst-ation mechanism being provided with a polarized relay having an operating and a restoring winding, contacts `in the telephones of said lines operated by the removal of the receiver at the substation for completing a circuit for the operating winding of the said polarized relay, means effective when the called subscriber responds to cause current to lowi through the operating winding of said relay in the proper direction to operate it, and contacts o-n said relay closed when the same is operated to complete a circuit through the restoring winding of said relay and for making said last circuit ineffective by connecting said operating ing of said polarized relay, means effective when the called subscriber responds to cause current to flow through the operating windinfg of said relay in the proper direction to operate it, and contacts on said relay closed when the same is operated to` complete a circuit thru the restoring winding of said relay and for making said last circuit ineffective by connecting said operating winding in multiple therewith while the calling subscriber has his receiver off the hook, the replacement of the receiver being effective to open the circuit extending thru said operating winding to permit* the circuit extending thru the restoring winding to be eiective.

5. In a telephone system, calling and called lines, automatic switches for connecting said lines, paystation mechanism on the calling line including a magnet havinig means for rendering the talking equipment on the calling line ineffective when the battery is reversed therethrough, another magnet normally inoperative, means controlled by the iirst magnet for closing a circuit for the other magnet, a shunt around said other magnet for preventing its operation, and means controlled by the resto-ration of the receiver at the calling station for removing said shunt to cause said other magnet to operate to prepare said first magnet for further ope-ration.

6. In a telephone system, calling and called lines, means for connecting said lines, paystation equipment on the calling line comprising a pair of magnets, one of said magnets operated by the response of the called subscriber for shunting the talking equipment on the calling line and for closing a circuit for the second magnet, means controlled by the deposit of a coin in said mec anism for removing the shunt from the talking equipment and rendering the rst magnet ineffective, a shunt around the second magnet preventing its operation, and means controlled by the restoration of the receiver at the calling station for opening said shunt, said second magnet operated in response to the opening of said last shunt to again render the irst magnet effective.

In witness whereof, I hereunto subscribe my name this 2d dayot May, A. D., 1923.

FRED T. MADSEN. 

